If you feel resentful toward your coworkers or are planning on quitting your job soon:
You could have Male, Female, and Transgendered tables, each of which point back to the Patient table. Only the Female table (and perhaps the Transgendered table) would have an isPregnant column.
You could have Male, Female, and Transgendered tables, each of which point back to the Patient table. Only the Female table (and perhaps the Transgendered table) would have an isPregnant column.